JP5228503B2 - Optical transmission line connection state monitoring method and system - Google Patents

Description

  The present invention relates to a technique for monitoring the connection state of an optical transmission line such as an optical fiber that connects a plurality of apparatuses, and preferably relates to a technique for preventing erroneous connection of an optical transmission line in an optical cross-connect device.

  In optical communication, when a frequency multiplexing technique for propagating optical signals having a plurality of different optical frequencies in one optical fiber is applied to an optical network, an optical cross-connect device is required (Patent Documents 1 and 2). Etc.).

  FIG. 6 is a block diagram showing an example of an optical cross-connect device related to the present invention. In FIG. 6, the signal light from the upstream of the device (1) is input to the optical splitter (11) from the input port (in) provided in the input section of the device (1), and a plurality of signals are output by the optical splitter (11). Branched into light. The branched signal light is input to the corresponding downstream cross-connect device (2) via the optical fiber (3) connected to the output port (out).

  On the other hand, in the downstream cross-connect device (2), the signal light from the upstream device (1) is input to the input port (in) via the optical fiber (3). The signal light input to the input port (in) is branched by the optical branch module (21), one is input to the wavelength selective switch module (23) via the optical isolator module (22), and the other is optical. Input to the monitoring module (24). In FIG. 6, device control units (10) and (20) are blocks for monitoring and controlling the devices (1) and (2), respectively, and the control unit (100) is the entire optical cross-connect device. It is a block that performs the monitoring control.

JP-A-8-130756 JP 2003-110504 A JP 9-325240 A JP 2001-215326 A JP-A-3-217128

  In the optical cross-connect device configured as described above, at least the cross-connect corresponding to the number N (N ≧ 2) of output ports (out) that output the signal light branched by the optical splitter (11) on the device (1) side A device (2) is provided, and a device (1) corresponding to the number M (M ≧ 2) of input ports (in) of the cross-connect device (2) is provided. The output port (out) of these devices (1) and the input port (in) of the cross-connect device (2) are each connected by an optical fiber (3).

  Therefore, as the capacity of the cross-connect device increases and the number of devices connected by one cross-connect system increases, the number of optical fiber connections increases and the possibility of erroneous connection increases. As means for solving such problems, a method of physically distinguishing each optical fiber by marking on the optical fiber, or a method of changing the connector and adapter shape of each optical fiber (Patent Documents 3 to 4 etc.) is proposed. Has been.

  However, in the method of physically distinguishing each optical fiber by marking on the optical fiber, it is difficult to reliably detect an optical fiber misconnection between apparatuses. In addition, changing the shape of optical fiber connectors and adapters is low in versatility, and it is very difficult to cope with the increase in the number of ports.

  On the other hand, in Patent Document 5, a transmitting device and a receiving device are connected by a plurality of connection lines, and in a transmission / reception device such as a cross-connect device or an exchange that performs transmission and reception of signals through the connection lines, Techniques have been proposed for preventing failures that occur due to incorrect connection of connection lines.

  In the transmission / reception device described in Patent Document 5, the transmission device side includes means for assigning a unique identification number to each connection line with respect to a signal transmitted to the connection line, and the reception device side includes the connection. Means is provided for detecting the identification number from a signal received via a line. And, by providing means for recognizing that the identification number detected by this identification number detection means is the identification number that should be received, it is easy to monitor the connection state of a plurality of links, and cause connection error. This prevents malfunctions that occur in

  A method of determining an erroneous connection by applying the technique described in Patent Document 5 to the optical cross-connect device of FIG. In that case, a unique identification number is assigned to each signal light branched from the optical splitter (11) of the upstream device (1) and output from the plurality of output ports (out) through the optical fiber (3). In the downstream cross-connect device (2) input to the input port (in), the identification number should be detected from the signal light input to each input port (in), and the detected identification number should be received originally It is determined whether or not it is an identification number.

  However, when this method is used, a unique identification number is given to the connection line to the unused part on the frame format of the main signal mounted on the signal light on the transmission side of the connection line, and on the reception side, Since the identification number assigned to the main signal frame format is detected and recognized, an area for assigning a unique identification number to the connection line must be prepared in the main signal frame format. Therefore, there is a problem of affecting the main signal.

  An object of the present invention is to provide a technique for monitoring a connection state of an optical transmission line such as an optical fiber capable of solving the above-described problems.

  An optical transmission line connection state monitoring method according to the present invention provides an optical transmission line in a transmission / reception apparatus that transmits and receives an optical signal through an optical transmission line between at least one first device and at least one second device. In this connection state monitoring method, the first device superimposes the superposed light superposed with the signal light on which specific label information is mounted on the light of a wavelength band different from the signal light for transmission and reception. To the second device, the second device separates the monitoring light from the received superimposed light, extracts label information from the separated monitoring light, and the extracted label information; The label information registered in advance as label information to be received by the second device is collated.

  The optical transmission path connection state monitoring system according to the present invention is an optical transmission in a transmission / reception apparatus that transmits and receives an optical signal through an optical transmission path between at least one first device and at least one second device. A connection state monitoring system for a road, wherein the first device superimposes monitoring light on which unique label information is mounted on light in a wavelength band different from the signal light for transmission and reception with the signal light, A monitoring light superimposing unit for outputting the superimposed superimposed light to the second device, wherein the second device is a monitoring light separating unit for separating the monitoring light from the superimposed light input from the first device; The label information is extracted from the separated monitoring light, and the label information collating means for collating the extracted label information with label information registered in advance as label information to be received by the second device. With features That.

  In the present invention, light having a wavelength outside the signal band on which label information is mounted is superposed (wavelength multiplexed) with signal light as monitoring light and transmitted via an optical transmission line connected between the devices. Label information to be received that has been acquired in advance by separating light (monitoring light) having a wavelength outside the signal band received via the optical transmission path and extracting label information mounted on the monitoring light; Since the verification is performed, the connection state of the optical transmission line can be monitored without affecting the signal light.

  Also, in the present invention, since misconnection is detected using light passing through the optical transmission line connecting the devices, even if the physical shape of the inter-device optical transmission line is the same, it is easy to make an error. Connection detection can be performed.

  FIG. 1 is a block diagram showing a first embodiment of the present invention.

  In this embodiment, the output port (out) of the device (1) and the input port (in) of the device (2) are connected by an optical fiber (3) and output from the output port (out) of the device (1). The target signal light is transmitted / received to the input port (in) of the device (2) via the optical fiber (3).

  The device (1) includes a light emitting module (12) as monitoring light generating means for generating monitoring light having label information unique to the device (1) for light in a wavelength band different from the signal light, and a light emitting module A multiplexing module (31) is provided as monitoring light superimposing means for superimposing (wavelength multiplexing) the monitoring light generated in (12) on the signal light and outputting the superposed light to the output port (out). Note that the light emitting module (12) as the monitoring light generating means may be provided outside the device (1).

  On the other hand, the device (2) monitors the superposed light input from the output port (out) of the device (1) through the optical fiber (3) to the input port (in) into signal light and monitoring light. An optical demultiplexing module (25) as an optical separation means, and the monitoring light separated by the optical demultiplexing module (25) is input, the label information is extracted from the monitoring light, and the extracted label information is A light receiving module (26) that functions as a label information collating unit that collates with label information that is preset and registered as label information to be received at the input port (in) of (2) is provided.

  In this embodiment, the signal light output from the output port (out) of the device (1) is superposed on the monitoring light emitted from the light emitting module (12) by the multiplexing module (31), and is wavelength multiplexed. Is output from the output port (out). The wavelength of the monitoring light emitted by the light emitting module (12) is different from the wavelength band of the signal light, and in this embodiment, the signal light is C band (1530 to 1560 nm wavelength band) or L band. (1570-1600 nm wavelength band) is used, and 1.51 μm band is used as the monitoring light emitted by the light emitting module (12).

  Wavelength multiplexed light consisting of signal light and monitoring light output from the output port (out) of the device (1) is input to the input port (in) of the device (2) via the optical fiber (3), and the device ( 2) The optical demultiplexing module (25) provided in 2) is demultiplexed into the signal light and the monitoring light, the signal light is output to the signal light processing unit inside the device (2), and the monitoring light is a label information matching means. Is output to the light receiving module (26) functioning as In the light receiving module (26), the correctness / incorrectness of the connection state of the optical fiber (3) is determined from the received monitoring light.

  Therefore, the device controller (10) of the device (1) has label information unique to the device (1) so that the device (1) connected to the input port (in) of the downstream device (2) can be identified. The light emitting module (12) of the device (1) is modulated by modulating light in the 1.51 μm band with label information unique to the device (1) assigned by the device control unit (10). Light on which label information unique to the device (1) is mounted is output as monitoring light.

  This monitoring light is superimposed (wavelength multiplexed) with the signal light by the optical multiplexing module (31), and the superimposed light is transmitted from the output port (out). On the other hand, in the downstream device (2), label information to be received from the input port (in) is registered in advance in the device control unit (20), and the light receiving module (26) of the device (2) receives the light receiving Label information to be received by the module (26) is set and registered by the device control unit (20).

  The light receiving module (26) extracts the label information mounted on the monitoring light by demodulating the monitoring light received by the light receiving module (26), and the light receiving module (26) registered in advance is Collation with the label information to be received is performed, and if there is a difference in the result, an alarm is given to the apparatus control unit (20). The control unit (100) controls the device control units (10) and (20) of the two devices.

  In the present embodiment, light having a wavelength outside the signal band on which label information unique to the transmission side apparatus is mounted is transmitted as a monitoring light via an optical fiber connected between the apparatuses, so that the signal light is affected. It is possible to monitor the connection state of the optical fiber without any problems. In particular, when there are a plurality of at least one of the device (1) and the device (2), an erroneous connection between the plurality of devices (1) and the device (2) can be quickly detected.

  FIG. 2 is a flowchart showing an optical fiber misconnection monitoring operation in the present embodiment. Hereinafter, the erroneous connection monitoring operation of this embodiment will be described with reference to FIGS.

  In the device (1), information on the label number unique to the device (1) to be transmitted is set and registered in advance from the device control unit (10) for the light emitting module (12) (S2). On the other hand, in the device (2), information on the label number of the device (1) to be received is registered in the light receiving module (26) from the device control unit (20) (S3). After registration is completed in each device, 1.51 μm band light modulated by the label number information assigned to the device (1) is output as monitoring light from the light emitting module (12) of the device (1) ( S4).

  This monitoring light is superimposed (wavelength multiplexed) with the signal light by the optical multiplexing module (31), and is output as superposed light from the output port (out) of the device (1) to the device (2) via the optical fiber (3). Is done. In the device (2), this superimposed light is input from the input port (in), and is demultiplexed into signal light and monitoring light by the optical demultiplexing module (25). The demultiplexed monitoring light is received by the light receiving module (26) (S5).

  In the light receiving module (26), the label number information mounted on the monitoring light is extracted from the received monitoring light and collated with the information of the label number to be received that is registered in advance (S6). If the actual received information and the expected value information are different from each other as a result of the collation (S7, NO), the fact that an erroneous connection has occurred is given as an alarm to the device control unit (20) (S8). If the actual received information matches the expected value information (S7, YES), it is determined that the connection is correct and no alarm is issued (S9).

  FIG. 3 is a block diagram showing a second embodiment of the present invention, and shows an embodiment when the present invention is applied to an optical cross-connect device.

  In the optical cross-connect device of this embodiment, the signal light input from the input port (in1) of the device (1) is superimposed (wavelength multiplexed) with the monitoring light emitted by the light emitting module (12), and the superimposed light To the optical splitter (11). The wavelength of the monitoring light emitted by the light emitting module (12) is different from the wavelength band of the signal light. In the present embodiment, the C band (1530 to 1560 nm wavelength band) or the L band (1570 to 1600 nm wavelength band) is used as the signal light, and the 1.51 μm band is used as the monitoring light emitted by the light emitting module (12). Used.

  The superimposed light input to the optical splitter (11) is branched into a plurality of output ports (out1, out2) by the optical splitter (11), and a plurality of downstream downstreams connected to each output port via the optical fiber (3). To the cross-connect device (device (2)). On the other hand, the downstream device (2) has a plurality of input ports (in2, in, 2) for inputting the superimposed light composed of the signal light and the monitoring light from the plurality of upstream devices (1) through the optical fiber (3). in3).

  In the optical cross-connect device (device (2)), the signal light and the monitoring light from the multiple upstream devices (1) input from the multiple input ports (in2, in3) are branched by the optical branch module (21), respectively. One is input to the wavelength selective switch module (23) via the optical isolator module (22), and the other is input to the optical demultiplexing module (25).

  The wavelength selective switch module (23) has a function of receiving signal light from a plurality of ports and selecting and outputting light of an arbitrary channel from an arbitrary port. Note that the wavelength selective switch module (23) itself is well known to those skilled in the art and is not directly related to the present invention, so the detailed internal configuration and description thereof will be omitted.

  In this embodiment, 1.51 μm band monitoring light is also input to the wavelength selective switch module (23), but the commercially available module is configured as a C-band wavelength selective switch module or an L-band wavelength selective switch module. Yes. For this reason, the loss amount of wavelengths other than the signal band of the C band or the L band is sufficiently large (about 30 dB), so the monitoring light output in the 1.51 μm band is sufficiently small so as not to affect the downstream transmission path. .

  On the other hand, the signal light and the monitoring light input to the optical demultiplexing module (25) are demultiplexed into the signal light and the monitoring light by this module (25), and the signal light is sent to the optical monitoring module (24). Output to the light receiving module (26). The light monitoring module (24) monitors the signal light. The light receiving module (26) receives the monitoring light and makes an erroneous connection determination.

  Therefore, the device control unit (10) of the upstream device (1) has a device (1) that can identify each of the plurality of upstream devices (1) connected to the plurality of input ports (in2, in3) of the downstream device (2). 1) Different label information is set for each.

  The light emitting module (12) of each upstream device (1) modulates the monitoring light with the label information unique to the device (1) assigned by the device control unit (10), so that the device (1 ) Output light with unique label information. The optical splitter (11) is configured to superimpose (wavelength multiplexed) the monitoring light on which the label information is mounted and the signal light input from the input port (in1) (superimposed light) into a plurality of output ports (out1, out2). Branch to).

  In the downstream cross-connect device (device (2)), each label information to be received from the plurality of input ports (in2, in3) of the device (2) is registered in advance in the device control unit (20). In the plurality of light receiving modules (26) of the device (2), label information to be received by the respective light receiving modules (26) is set and registered from the device control unit (20).

  Each light receiving module (26) extracts the label information mounted on the monitoring light by demodulating the monitoring light received by the respective light receiving module (26), and the label information to be received by the light receiving module (26). If there is a difference in the results, an alarm is given to the device control unit (20). The control unit (100) controls the device control units (10) and (20) of the two devices.

  In the present embodiment, monitoring light obtained by performing different labeling for each upstream device (1) on light in a wavelength band different from the wavelength band of the signal light is generated and superimposed on the signal light, and this is performed on the downstream device (2) side. By comparing the label information received from the monitoring light with the label information to be received, the correctness / incorrectness of the optical fiber connection is determined. Accordingly, it is possible to quickly detect an erroneous fiber connection between different devices without affecting the signal light, and to prevent an erroneous fiber connection between different devices.

  In the optical cross-connect device of this embodiment, different label information is provided for each optical splitter that branches signal light from the upstream input to the input port to N (N ≧ 2) output ports. Can do. Therefore, it is possible to reduce the number of monitoring light generation means and label information to be added to 1 / N, simplify the system configuration, and efficiently monitor the connection state of optical fibers.

  FIG. 4 is a block diagram showing a third embodiment of the present invention in which the second embodiment is configured bidirectionally.

  Similarly to the second embodiment, the signal light input from the input port (in1) of the device (1) is different from the wavelength band of the signal light emitted from the light emitting module (12). It is superposed (wavelength multiplexed) with the monitoring light in the band and input to the optical splitter (11) as superposed light. The C band (1530 to 1560 nm wavelength band) or the L band (1570 to 1600 nm wavelength band) is used as the signal light, and the 1.51 μm band is used as the monitoring light emitted by the light emitting module (12).

  The superimposed light input to the optical splitter (11) is branched into a plurality of output ports (out1, out2) by the optical splitter (11), and is connected downstream via an optical fiber (3) for each output port. Output to multiple cross-connect devices (device (2)). On the other hand, the downstream device (2) has a plurality of input ports (in2, in, 2) for inputting the superimposed light composed of the signal light and the monitoring light from the plurality of upstream devices (1) through the optical fiber (3). in3).

  In the cross-connect device (device (2)), the signal light and monitoring light from the multiple upstream devices (1) input from the multiple input ports (in2, in3) are branched by the optical branch module (21), respectively. One is input to the wavelength selective switch module (23) via the optical isolator module (22), and the other is input to the optical demultiplexing module (25).

  The signal light and monitoring light input to the optical demultiplexing module (25) are demultiplexed into signal light and monitoring light by this module (25), the signal light is sent to the optical monitoring module (24), and the monitoring light is received by the light receiving module. Output to (26). The light monitoring module (24) monitors the signal light. The light receiving module (26) receives the monitoring light and makes an erroneous connection determination. Therefore, the device control unit (10) of the upstream device (1) has a device (1) that can identify each of the plurality of upstream devices (1) connected to the plurality of input ports (in2, in3) of the downstream device (2). 1) Different label information is set for each.

  The light emitting module (12) of each upstream device (1) modulates the monitoring light with the label information unique to the device (1) assigned by the device control unit (10), so that the device (1 ) Output light with unique label information. The optical splitter (11) is configured to superimpose (wavelength multiplexed) the monitoring light on which the label information is mounted and the signal light input from the input port (in1) (superimposed light) into a plurality of output ports (out1, out2). Branch to).

  In the downstream cross-connect device (device (2)), each label information to be received from the plurality of input ports (in2, in3) of the device (2) is registered in advance in the device control unit (20). In the plurality of light receiving modules (26) of the device (2), label information to be received by the respective light receiving modules (26) is set and registered from the device control unit (20).

  Each light receiving module (26) extracts the label information mounted on the monitoring light by demodulating the monitoring light received by the respective light receiving module (26), and the label information to be received by the light receiving module (26). If there is a difference in the results, an alarm is given to the device control unit (20). The control unit (100) controls the device control units (10) and (20) of the two devices.

  On the other hand, the signal light input from the input port (in1) of the device (2) is superimposed (wavelength multiplexed) with the monitoring light of the wavelength band different from the wavelength band of the signal light emitted by the light emitting module (28). Then, it is input to the optical splitter (27) as superimposed light. Similarly, the wavelength of the signal light and the monitoring light is C band (1530 to 1560 nm wavelength band) or L band (1570 to 1600 nm wavelength band) as the signal light, and the monitoring light emitted by the light emitting module (12) is used. 1.51 μm band is used.

  The superposed light input to the optical splitter (27) is branched into a plurality of output ports (out1, out2) by the optical splitter (27), and a plurality of downstream ports connected via optical fibers (3) for each output port. To the cross-connect device (device (1)). On the other hand, the downstream device (1) has a plurality of input ports (in2, in) for inputting the superimposed light composed of the signal light and the monitoring light from the plurality of upstream devices (2) through the optical fiber (3). in3).

  In the optical cross-connect device (device (1)), the superimposed light composed of the signal light and the monitoring light from the plurality of upstream devices (2) input from the plurality of input ports (in2, in3) Branched at 13), one is input to the wavelength selective switch module (15) via the optical isolator module (14), and the other is input to the optical demultiplexing module (16).

  The signal light and monitoring light input to the optical demultiplexing module (16) are demultiplexed into signal light and monitoring light by this module (16), the signal light is sent to the optical monitoring module (17), and the monitoring light is received by the light receiving module. Output to (18). The light monitoring module (17) monitors the signal light. The light receiving module (18) receives the monitoring light and determines an erroneous connection. Therefore, the device control unit (20) of the upstream device (2) is configured so that a plurality of upstream devices (2) connected to a plurality of input ports (in2, in3) of the downstream device (1) can be identified respectively. 2) Different label information is set for each.

  The light emitting module (28) of each upstream device (2) modulates the monitoring light with the label information unique to the device (2) assigned by the device control unit (20), thereby adding the device (2 ) Output light with unique label information. The optical splitter (27) is configured to superimpose (wavelength multiplexed) the monitoring light on which the label information is mounted and the signal light input from the input port (in1) (superimposed light) into a plurality of output ports (out1, out2). Branch to).

  In the downstream cross-connect device (device (1)), the respective label information to be received from the plurality of input ports (in2, in3) of the device (1) is registered in advance in the device control unit (10), In the plurality of light receiving modules (18) of the device (1), label information to be received by each light receiving module (18) is set and registered by the device control unit (10).

  Each light receiving module (18) extracts the label information mounted on the monitoring light by demodulating the monitoring light received by each light receiving module (18), and the label information to be received by the light receiving module (18). If there is a difference in the results, an alarm is given to the device control unit (10). The operation of the present embodiment is the same as that of the second embodiment except that the second embodiment is configured bidirectionally.

  In the above embodiment, the signal light is the L band and the C band, but the present invention can be applied to signal light having an arbitrary wavelength. Moreover, although the wavelength of the light emitted from the light emitting module is 1.51 μm band, it can be applied at any wavelength other than the applied signal light.

  FIG. 5 is a block diagram showing a fourth embodiment of the present invention. Although the basic configuration of this embodiment is the same as that of the third embodiment, the number of connection ports to the downstream device, the number of connection ports from the upstream device, signal light monitoring, and erroneous connection detection are further devised.

  Also in this embodiment, the signal light input from the input port (in1) of the device (1) is superposed on the monitoring light (wavelength) different from the wavelength band of the signal light emitted by the light emitting module (12). Multiplexed) and input to the optical splitter (11) as superimposed light. The superimposed light input to the optical splitter (11) is branched into a plurality of (four) output ports (out1 to out4) by the optical splitter (11) and connected to each output port via the optical fiber (3). The data is output to a plurality of (four) cross-connect devices (device (2)) downstream.

  The downstream device (2) has a plurality (four) for inputting the superposed light composed of the signal light and the monitoring light from the plurality of (four) upstream devices (1) through the optical fiber (3). Input ports (in1 to in4). The superimposed light from the multiple (4) upstream devices (1) input from the multiple (4) input ports (in1 to in4) is branched by the optical branch module (21), respectively, The signal is input to the wavelength selective switch module (23) via the isolator module (22), and the other is input to the optical switch (29).

  The output light from the optical switch (29) is input to the common optical monitoring module (24) by the common optical demultiplexing module (25), and the monitoring light is input to the common light receiving module (26). The The optical switch (29) receives superimposed light from a plurality (four) of upstream devices (1) that are input from a plurality (four) of input ports (in1 to in4) and branched by the optical branch module (21). It has a function of switching to time division and outputting to the optical demultiplexing module (25). Accordingly, the light monitoring module (24) and the light receiving module (26) can be constituted by one light monitoring module (24) and a light receiving module (26), respectively, and the configuration can be further simplified.

  In the present embodiment, the optical switch (29) is also supplied with the signal light branched from the output light of the wavelength selective switch module (23) by the optical branch module (21), and the wavelength selective switch module (23) By configuring the output light to be time-divisionally monitored, it becomes possible to simultaneously monitor the output light of the wavelength selective switch module (23) via the optical switch (29), thereby further simplifying the configuration. be able to.

  On the other hand, the signal light input from the input port (in1) of the device (2) is superimposed (wavelength multiplexed) with the monitoring light of the wavelength band different from the wavelength band of the signal light emitted by the light emitting module (28). Then, it is input to the optical splitter (27) as superimposed light. The superimposed light input to the optical splitter (27) is branched into a plurality (four) of output ports (out1 to out4), and a plurality of downstream (4) connected to each output port via the optical fiber (3). Output) to the cross-connect device (device (1)).

  The downstream device (1) is used to input the superposed light composed of the signal light and the monitoring light from the upstream (4) devices (2) via the optical fiber (3). Input ports (in1 to in4). Superimposed light from the multiple (4) upstream devices (2) input from the multiple (4) input ports (in1 to in4) is branched by the optical branch module (13), respectively, The signal is input to the wavelength selective switch module (15) via the isolator module (14), and the other is input to the optical switch (19).

  The output light from the optical switch (19) is input to the common optical monitoring module (17) by the common optical demultiplexing module (16), and the monitoring light is input to the common light receiving module (18). The The optical switch (19) receives superimposed light from a plurality (4) of upstream devices (2) that are input from a plurality (4) of input ports (in1 to in4) and branched by an optical branch module (13). Are switched in a time division manner and output to the optical demultiplexing module (16).

  In the present embodiment, the optical splitters (11) and (27) branch the input signal light into a plurality (four) of ports, and the input ports from the upstream device in the downstream device are a plurality (four) of ports. Can be assembled. This configuration can be realized by using a wavelength selective switch or an optical switch that can input the number of ports. Also, a hybrid configuration of the configuration shown in FIG. 4 and the configuration shown in FIG. 5 is possible.

  Since the operation is the same as that of the basic configuration described above, detailed description is omitted, but in this embodiment, the optical demultiplexing module and the optical monitoring module are combined into one by switching the switches. Therefore, the configuration can be simplified accordingly.

  As described above, in the present embodiment, since a plurality of ports are collectively monitored and labeling result comparison is performed using an optical switch, cross-connect connections of more ports are erroneously connected with a relatively simple configuration. It is possible without any trouble. Therefore, if there are wavelength selective switches and optical switches, this configuration can be realized with any number of output ports and any number of input ports.

  In each of the above embodiments, the optical fiber (3) is used as a connection means between the device (1) and the device (2), but the present invention is not limited to the optical fiber, and is configured as an optical waveguide. Any possible optical transmission line can be used as a connection means between the device (1) and the device (2).

It is a block diagram which shows the 1st Embodiment of this invention. It is a flowchart which shows the misconnection monitoring operation | movement of this embodiment. It is a block diagram which shows the 2nd Embodiment of this invention. It is a block diagram which shows the 3rd Embodiment of this invention. It is a block diagram which shows the 4th Embodiment of this invention. It is a block diagram which shows the example of the optical cross-connect apparatus relevant to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Apparatus 3 Optical fiber 10, 20 Apparatus control part 11, 27 Optical splitter 12, 28 Light emitting module 13, 21 Optical branch module 14, 22 Optical isolator module 15, 23 Wavelength selection switch module 16, 25 Optical demultiplexing module 17 , 24 Optical monitoring module 18, 26 Light receiving module 19, 29 Optical switch 31 Optical multiplexing module 100 Control unit

Claims (12)

An optical transmission path connection state monitoring system in a transmission / reception apparatus that transmits and receives an optical signal through an optical transmission path between at least one first apparatus and at least one second apparatus,
The first device superimposes monitoring light on which unique label information is mounted on light in a wavelength band different from the signal light for transmission and reception with the signal light, and superimposes the superimposed superimposed light on the second light A superimposing light superimposing means for outputting to the apparatus,
The second device extracts monitoring light from the superposed light input from the first device, and extracts the label information from the separated monitoring light, and extracts the extracted label information. And a label information collating unit for collating with label information registered in advance as label information to be received by the second device ,
The transmitting / receiving device includes M first devices (M ≧ 2) and N second devices (N ≧ 2), and each of the M first devices includes the superimposed light. N (N ≧ 2) output ports, and the N second devices each have M (M ≧ 2) input ports for inputting signal light, An optical transmission line connecting between each of the N output ports of the M first devices and each of the M input ports of the N second devices;
The transmission / reception device is configured as an optical cross-connect device, and the first device includes an optical splitter that branches the signal light input to an input port to the N (N ≧ 2) output ports. The apparatus includes a wavelength selective switching module that performs wavelength selective switching by inputting M signal lights from the M first apparatuses,
The supervisory light separating means includes M optical branch modules respectively connected between the M input ports and the wavelength selective switching module, and the superimposed light respectively branched by the M optical branch modules. , And an optical switch for switching and outputting the M superimposed lights in a time division manner, and demultiplexing the M multiplexed lights output from the optical switch into the signal light and the monitoring light. The label information matching means extracts the label information in a time-sharing manner from the M monitoring lights demultiplexed by the common optical demultiplexing module, and extracts the label information. The M label information is collated with different label information registered in advance as label information to be received by each of the M input ports in a time division manner, and the collation result is obtained in a time division manner. Common connection condition monitoring system of the optical transmission path, characterized in <br/> be composed by the light-receiving module force. 2. The light according to claim 1 , further comprising a common optical monitoring module that inputs the M signal lights demultiplexed by the optical demultiplexing module in a time division manner and monitors the signal light. Transmission line connection status monitoring system. A second optical branching module for branching the output light of the wavelength selective switching module; and the optical switch includes the M superposed lights branched by the M optical branching modules and the second optical branching module. The wavelength selective switching module branched in step (b) is input and switched in a time-sharing manner, and the common optical monitoring module is separated from the M optical branching modules. 3. The optical transmission line connection state monitoring system according to claim 2 , further comprising a function of receiving and monitoring each signal light and the output light of the wavelength selective switching module in a time-sharing manner. Transmission identification label setting means for setting and registering the label information for each first device, reception identification label setting means for setting and registering label information to be received by the light receiving module in the second device, and the label information The optical transmission path connection state monitoring system according to any one of claims 1 to 3 , further comprising alarm generation means for generating an alarm when both of them are different as a result of collation by the collation means. . An optical transmission path connection state monitoring system in a transmission / reception apparatus that transmits and receives an optical signal through an optical transmission path between at least one first apparatus and at least one second apparatus,
The first device superimposes monitoring light on which unique label information is mounted on light in a wavelength band different from the signal light for transmission and reception with the signal light, and superimposes the superimposed superimposed light on the second light A superimposing light superimposing means for outputting to the apparatus,
The second device extracts monitoring light from the superposed light input from the first device, and extracts the label information from the separated monitoring light, and extracts the extracted label information. And a label information collating unit for collating with label information registered in advance as label information to be received by the second device,
The transmitting / receiving device includes M first devices (M ≧ 2) and N second devices (N ≧ 2), and each of the M first devices includes the superimposed light. N (N ≧ 2) output ports, and the N second devices each have M (M ≧ 2) input ports for inputting signal light, An optical transmission line connecting between each of the N output ports of the M first devices and each of the M input ports of the N second devices;
The transmission / reception device is configured as an optical cross-connect device, and the first device includes an optical splitter that branches the signal light input to an input port to the N (N ≧ 2) output ports. The apparatus includes a wavelength selective switching module that performs wavelength selective switching by inputting M signal lights from the M first apparatuses,
In each of the N second devices, an optical splitter for branching the signal light input to the input port to M output ports, and a unique label different from each other for light of a wavelength band different from that of the signal light The monitoring light superimposing means for superimposing the monitoring light carrying information on the signal light, and the optical branching means for branching the superposed light superimposed by the monitoring light superimposing means to the M output ports by the optical splitter. ,
N input ports to which one of the M output ports of the second device is connected to each of the M first devices via an optical transmission line, and the N inputs A wavelength selective switching module for performing wavelength selective switching by inputting signal light from the N second devices input to the port via the optical transmission line; the N input ports and the wavelength selective switching; A monitoring light separating means for separating the monitoring light from the superposed light and a label information checking means for checking the unique label information that is different for each input port.
Wherein the N optical transmission line you characterized by further comprising an optical transmission line for connecting N input ports of the M output ports and the M first unit of the second device Connection status monitoring system. The supervisory light separating means provided in the first apparatus includes N optical branch modules connected between the N input ports and the wavelength selective switching module, and the N optical branch modules. The N information demultiplexing modules for separating the N superimposed lights branched in step 1 into the signal light and the monitoring light, respectively, and the label information collating means provided in the first device comprises the N The label information is extracted from the monitoring light demultiplexed by the optical demultiplexing modules, the extracted label information is collated with the label information registered in advance for each input port, and the collation result is output. 6. The optical transmission line connection state monitoring system according to claim 5 , wherein the optical transmission line connection state monitoring system is configured by a light receiving module. 7. The optical monitoring module according to claim 6 , further comprising N optical monitoring modules that respectively receive the N signal lights demultiplexed by the N optical demultiplexing modules and monitor the signal light. Optical transmission line connection status monitoring system. The supervisory light separating means provided in the first apparatus includes N optical branch modules connected between the N input ports and the wavelength selective switching module, and the N optical branch modules. The N superposed lights branched in step N are input, the N superposed lights are switched and output in a time division manner, and the N superposed lights output in a time division manner from the optical switch are respectively supplied to the signal. The label information verification means provided in the first device is configured by the N number of optical signals demultiplexed by the common optical demultiplexing module. The label information is extracted from the monitoring light in a time division manner, and the extracted N pieces of label information are collated with the label information registered in advance for each input port in a time division manner, and the collation result is output in a time division manner. Common Connection state monitoring system of the optical transmission line according to claim 5, characterized in that it is constituted by an optical module. 9. The light according to claim 8 , further comprising a common optical monitoring module that inputs the N signal lights demultiplexed by the optical demultiplexing module in a time division manner and monitors the signal light. Transmission line connection status monitoring system. A second optical branching module for branching the output light of the wavelength selective switching module; and the optical switch includes the N superimposed lights branched by the N optical branching modules and the second optical branching module. A function of inputting the output light of the wavelength-selective switching module branched in a step and switching and outputting in a time-sharing manner, and the common optical monitoring module includes the N signal lights and the wavelength-selective switching module. 10. The optical transmission line connection state monitoring system according to claim 9 , wherein the system has a function of receiving and monitoring output light in a time-sharing manner. Transmission identification label setting means for setting and registering the label information for each second device, reception identification label setting means for setting and registering label information to be received by the light receiving module in the first device, and the label information The optical transmission path connection state monitoring system according to any one of claims 6 to 10 , further comprising: an alarm generation unit that generates an alarm when both of them are different as a result of verification by the verification unit. . As the signal light, wavelength light in the C band (1530 to 1560 nm wavelength band) or L band (1570 to 1600 nm wavelength band) is used, and a light emitting module that generates 1.51 μm band light as the monitoring light is provided. The connection state monitoring system for an optical transmission line according to any one of claims 1 to 11 .

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